Structure for connecting a head to a non-circular cylinder of a bicycle tire pump

ABSTRACT

A bicycle tire pump includes a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages into which two pistons are respectively and movably received. A head is mounted to the top of the cylinder and has two ways defined therein which respectively communicate with the two passages in the cylinder and an outlet of the head. A bolt extends through one of the two passages and is threadedly connected to the head. The bolt has a longitudinal passage defined therethrough which communicates with one of the two ways.

FIELD OF THE INVENTION

The present invention relates to a bicycle tire pump, and moreparticularly, to a structure for connecting the head to the non-circularcylinder of the pump so as to have a strong connection between the headand the cylinder.

BACKGROUND OF THE INVENTION

Referring to FIG. 5, a type of conventional bicycle tire pump includes anon-circular cylinder 41 and a head 40 which is attached to the cylinder41. The non-circular cylinder 41 includes two circular tubes connectedside by side so that there have are two passages defined in thenon-circular cylinder 41 with two sets of piston device devices (Figurenot shown) respectively received in the two passages. The head 40 has avalve received therein and communicate communicating with the twopassages so that when operating the two sets of the piston devicedevices, pressurized air will flow through the valve. The head 40generally is connected to the non-circular cylinder 41 simply by way ofgluing, and the gluing area between the head 40 and the non-circularcylinder 41 is limited so that the head 40 tends to disengage from thenon-circular cylinder 41. Once there has is leakage defined between thehead 40 and the non-circular cylinder 41, the bicycle tire pump isfunctionless.

The present invention intends to provide a structure for connecting thehead to the non-circular cylinder of the bicycle tire pump, wherein aconnecting member is securely received in the head and a bolt having apassage defined therethrough extends through the cylinder to be fixedlyconnected to the connecting member so as to provide a strong connectionbetween the head and the non-circular cylinder. The present invention isdesigned to mitigate and/or obviate the disadvantage of the conventionaltire pump.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, there isprovided a bicycle tire pump comprising a cylinder having two passagesdefined therethrough which are separated by a board, two openingsrespectively defined in a top of the cylinder and communicating with thetwo passages. Two pistons are respectively and movably received in thetwo passages.

A head is mounted to the top of the cylinder and has an outlet definedin one of two ends thereof with a valve received in the outlet. Two waysare defined in the head and respectively communicate with the twopassages. A bolt extends through one of the two passages and isthreadedly connected to the head, the bolt having a longitudinal passagedefined therethrough which communicates with one of the two ways.

An object of the present invention is to provide the bicycle tire pumphaving two passages defined in the cylinder and the head mounted to thecylinder, a bolt extending through one of the two passages andthreadedly engaged with the head to securely connect the head to thecylinder.

Further objects, advantages, and features of the present invention willbecome apparent from the following detailed description with appropriatereference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the bicycle tire pump in accordance withthe present invention;

FIG. 2 is an exploded view of the bicycle tire pump in accordance withthe present invention;

FIG. 3 is a side elevational view, partly in section, of the bicycletire pump in accordance with the present invention, and ;

FIG. 4 is a side elevational view, partly in section, of anotherembodiment of the bicycle tire pump in accordance with the presentinvention, ; and

FIG. 5 is an illustrative view to illustrate the conventional bicycletire pump.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 through 3, the bicycle tire pump in accordance withthe present invention comprises a non-circular 10 having two passages16, 161 defined therethrough which are separated by a board 162, twoopenings respectively defined in a top of the cylinder 10 andcommunicating with the two passages 16, 161. Each of the two openings isenclosed by a an annular lip 11/12, and two pistons 30, 31 arerespectively and movably received in the two passages 16, 161. Thepassage 16 has a threaded inner periphery 160 defined near the top ofthe cylinder 10 so as to be threadedly engaged with the sleeve member151 which has a central hole 1510 defined therethrough.

A head 20 is mounted to the top of the cylinder 10 and has an outlet 211defined in one of two ends thereof. A valve 25 is received in the outlet211 and the head 20 has two ways 220, 230 defined therein whichrespectively communicate with the two passages 16, 161 so that whenoperating the two pistons 30, 31, pressurized air enters the head 20 viathe two ways 220, 230 and into the tire (not shown) to be inflated viathe valve 25. A tubular member 26 is received in the outlet 211 andmounted to the valve 25, a. A cap 27is threadedly mounted to the end ofthe head 20having the valve 25. Two necks 22, 23 respectively extendfrom a lower portion of the head 20 and each of which has a skirtportion 221/231. A connecting member 24 is fixedly received in the head20 and has a threaded hole 241 defined centrally therethrough.

A bolt 15 extends through the passage 16 and the central hole 1510 ofthe and sleeve member 151, and the bolt 15 is threadedly connected withthe threaded hole 241 of the connecting member 24. The bolt 15 furtherhas a longitudinal passage 152 defined therethrough which communicateswith one of the two ways 220, 230.

Two seals 13, 14 are respectively received between the two necks 22, 23and two annular lips 11, 12 when the head 20 is mounted to the cylinder10 so as to prevent leaking between the cylinder 10 and the head 20.Accordingly, pressurized air flows through the longitudinal passage 152of the bolt 15, the two ways 220, 230 and out from the valve 25. Theengagement between the bolt 15 and the connecting member 24 provides asecure connection between the head 20 and the cylinder 10. It is to benoted that the two skirt portions 221, 231 can also to connect beconnected to the cylinder 10 by glue, and there may have be two sets ofthe connecting member 24, the sleeve member 151 and the bolt 15 so as toenhance the connection between the head 20 and the cylinder 10.

Referring to FIG. 4, in order to have more passages or paths for thepressurized air to pass, a further way 201 is further defined throughthe body of the head 20 and located in parallel with the two ways 220,230. The sleeve member 151 and the connecting member 24 may have furtherpaths 1511 and 240 respectively defined therethrough, wherein the paths1511, 240 and the way 201 are located in alignment with each other. Theway 201 communicates with the valve 25, and the path 1511 communicateswith the passage 16through a hole 2000 in the bolt 15. Accordingly, alarge amount of air can enter the head 20 during one operation of thetwo pistons 30, 31.

The invention is not limited to the above embodiment but variousmodification modifications thereof may be made. It will be understood bythose skilled in the art that various changes in form and detail may bemade without departing from the scope and spirit of the presentinvention.

What is claimed is:
 1. A bicycle tire pump comprising: a cylinder havingtwo passages defined therethrough which are separated by a board, twoopenings respectively defined in a top of said cylinder andcommunicating with said two passages, two pistons respectively andmovably received in said two passages; a head mounted to said top ofsaid cylinder and having an outlet defined in one of two ends thereof, avalve received in said outlet and two ways defined in said head andrespectively communicating with said two passages, and a bolt extendingthrough one of said two passages and threadedly connected to said head,said bolt having a longitudinal passage defined therethrough whichcommunicates with one of said two ways.
 2. The bicycle tire pump asclaimed in claim 1 further comprising a connecting member fixedlyreceived in the head, said connecting member having a threaded holedefined centrally therethrough so that said bolt is threadedly engagedwith said threaded hole.
 3. The bicycle tire pump as claimed in claim 1further comprising a sleeve member fixedly received in said passagewhere the bolt extends, said bolt extending thorough through said sleevemember.
 4. The bicycle tire pump as claimed in claim 3, wherein saidsleeve member is threadedly received in said passage.
 5. The bicycletire pump as claimed in claim 1, wherein said head has a skirt portionin which said top of said cylinder is received.
 6. A bicycle tire pumpcomprising: a cylinder having two passages defined therethrough whichare separated by a board, two openings respectively defined in a top ofsaid cylinder and communicating with said two passages, two pistonsrespectively and movably received in said two passages; a head mountedto said top of said cylinder and having an outlet defined in one of twoends thereof, a valve received in said outlet and two ways defined insaid head and respectively communicating with said two passages; asleeve member fixedly received in one of said two passages and a boltextending through said sleeve member and threadedly connected to saidhead, and a first path defined through said sleeve member and said boltand a second path defined in said head and communicating with said firstpath, said first path communicating with said passage having said sleevemember and said bolt and said second path communicating with said valve.7. The bicycle tire pump as claimed in claim 6 further comprising aconnecting member fixedly received in the head, said connecting memberhaving a threaded hole defined centrally therethrough so that said boltis threadedly engaged with said threaded hole.
 8. The bicycle tire pumpas claimed in claim 6, wherein said sleeve member is threadedly receivedin said passage.
 9. The bicycle tire pump as claimed in claim 6, whereinsaid head has a skirt portion in which said top of said cylinder isreceived.
 10. The bicycle tire pump as claimed in claim 6, wherein saidbolt has a longitudinal passage defined therethrough which communicateswith one of said two ways.
 11. A bicycle tire pump comprising: acylinder including a non-circular outer periphery, the cylinderincluding an interior; at least a first piston movably received in theinterior of the cylinder; a head directly mounted on top of the cylinderin a nonrotatable manner and including an outlet that is communicatedwith the interior of the cylinder; and means mounted in the interior ofthe cylinder and having a first end securely retained in the interior ofthe cylinder and a second end extended beyond the cylinder for securelyengaging with the head, with the head and the outlet being separablefrom the cylinder only by removal of the engaging means.
 12. The bicycletire pump as claimed in claim 11, wherein said engaging means is a bolt,and wherein the head includes a threaded hole for engaging with thebolt.
 13. The bicycle tire pump as claimed in claim 12, furthercomprising a sleeve member securely mounted in the interior of thecylinder, the sleeve member including a longitudinal hole through whichthe bolt extends.
 14. The bicycle tire pump as claimed in claim 13,wherein the sleeve member is threadedly received in the interior of thecylinder.
 15. The bicycle tire pump as claimed in claim 11, wherein thehead has a skirt portion in which the top of the cylinder is received.16. The bicycle tire pump as claimed in claim 11, wherein said engagingmeans is a bolt, and wherein the head includes a connecting memberfixedly mounted therein, the connecting member including a threaded holefor engaging with the bolt.
 17. The bicycle tire pump as claimed inclaim 11, wherein the interior of the cylinder is cylindrical.
 18. Thebicycle tire pump as claimed in claim 11, wherein the head includes twonecks extending from a lower portion thereof, said necks being integralwith the head and configured for engaging with the non-circular outerperiphery of the cylinder, the second end of the engaging means beingengaged with one of said necks.
 19. A bicycle tire pump comprising: acylinder including a non-circular outer periphery, the cylinderincluding an interior; at least a first piston movably received in theinterior of the cylinder; a head mounted on top of the cylinder andincluding an outlet that is communicated with the interior of thecylinder; and means mounted in the interior of the cylinder and having afirst end securely retained in the interior of the cylinder and a secondend extended beyond the cylinder for securely engaging with the head,wherein the interior of the cylinder includes two passages definedtherethrough, the two passages being separated by a board, the headincluding two ways that are communicated with the outlet and that arecommunicated with the passages, respectively; said engaging means beinga bolt extending through one of the passages of the cylinder and one ofthe ways of the head and threadedly connected with the head.
 20. Thebicycle tire pump as claimed in claim 19, wherein the bolt comprises alongitudinal hole that communicates said one of the passages of thecylinder with said one of the ways of the head.
 21. The bicycle tirepump as claimed in claim 20, further comprising a sleeve member securelymounted in said one of the passages of the cylinder, the sleeve memberincluding a longitudinal hole through which the bolt extends.
 22. Thebicycle tire pump as claimed in claim 21, wherein the sleeve member isthreadedly received in said one of the passages of the cylinder.
 23. Thebicycle tire pump as claimed in claim 19, wherein the head has a skirtportion in which the top of the cylinder is received.
 24. The bicycletire pump as claimed in claim 19, wherein the head includes a connectingmember fixedly mounted therein, the connecting member including athreaded hole for engaging with the bolt.